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| 型号： | KIT33989DWEVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 53/72页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL 33989DW HS SBC |
| 标准包装： | 1 |
| 主要目的： | 接口，CAN 控制器 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MC33989 |
| 主要属性： | CAN 2.0 系统基础芯片（SBC），SPI 接口，2 低压降稳压器 |
| 次要属性： | 故障检测，睡眠和待机模式 |
| 已供物品： | 板，CD |
| 相关产品： | MC33989DWR2CT-ND - IC SYSTEM BASE W/CAN 28-SOIC MC33989DWR2TR-ND - IC SYSTEM BASE W/CAN 28-SOIC MC33989DW-ND - IC SYSTEM BASE W/CAN 28-SOIC |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
57
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
Table 36. Current in Case of Bus Short Conditions
Notes
34.
For the failure case which leads to loss of communication and current flow for a very short time period as illustrated in Figure 45. So for
instance for CANH to gnd, the impact of the peak current on the V2 voltage regulator is very limited. The TX, RX, and CAN signal in the
figure are placed in a CANH to CANL short-circuit condition.
Figure 45. CANH to CANL Short-circuit Condition
The sender node drives TX and the CAN bus, but doesn’t receive anything on RX, so the CAN protocol handler inside the
MCU increases its TEC transmit error counter by 8.The sender node keeps driving TX in dominant until it reaches the error
passive level (TEC=128).
When it is in error passive, it sends a passive error frame (23 bits in recessive). Then the sender nodes drive the bus and send
only 1 dominant bit, and as nothing is received on RX, the TEC is incremental by 8. After TX is driven 15 times, the TEC reaches
255: then the node is in the BUS OFF state.
When the node is in the BUS OFF state, it needs 128 occurrences of 11 recessive bits (1.408 ms at 1.0 MB) in order to recover
and be able to transmit again.
Condition
I term
current
I_H
current
I-L
current
Comment
peak current (mA)
No failure
32
0
Normal communication.
CANH line to GND
0
150
0
No communication. Current flowing from V2 pin, during CAN driver dominant
state. (34)
CANH line to 5.0 V
55
-55
0
communication OK.
CANH line to +VBAT
150
-150
0
communication OK.
CANL line to GND
50
0
50
communication OK.
CANL line to 5.0 V
0
-150
no communication (34)
CANL line to VBAT
0
-240
no communication (34)
CANH line shorted to
CANL line
0
70
-70
no communication (34)
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